The midfielder has signed a new deal that will keep him with the team until 2030.
Gorrotxategi has been a part of Real Sociedad for over eight years and is highly valued within the Spanish football community.
The player appreciates the management at Real Sociedad, where he has had the opportunity to develop his skills since joining the team at the age of 15.
Gorrotxategi spent the last season on loan with Segunda Division side Mirandes.